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Evidence of silicic acid leakage to the tropical Atlantic via Antarctic Intermediate Water during Marine Isotope Stage 4 ArchiMer
Griffiths, James D.; Barker, Stephen; Hendry, Katharine R.; Thornalley, David J. R.; Van De Flierdt, Tina; Hall, Ian R.; Anderson, Robert F..
Antarctic Intermediate Water (AAIW) and Subantarctic Mode Water (SAMW) are the main conduits for the supply of dissolved silicon (silicic acid) from the deep Southern Ocean (SO) to the low-latitude surface ocean and therefore have an important control on low-latitude diatom productivity. Enhanced supply of silicic acid by AAIW (and SAMW) during glacial periods may have enabled tropical diatoms to outcompete carbonate-producing phytoplankton, decreasing the relative export of inorganic to organic carbon to the deep ocean and lowering atmospheric pCO(2). This mechanism is known as the silicic acid leakage hypothesis (SALH). Here we present records of neodymium and silicon isotopes from the western tropical Atlantic that provide the first direct evidence of...
Tipo: Text Palavras-chave: Silica leakage; Diatom; Carbon dioxide; SAMW; AAIW.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00264/37526/35763.pdf
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